Flylinktech Bluetooth Smartwatch Phone With Sim Card Slot Watchphone GSM Quad-band Unlocked Wristwatch Phone (S18-Black) Smart watch S18 has 1.54 inch LCD screen with a resolution of 240x240, providing the fantastic touch experience and visual enjoyment. Support Bluetooth 3.0; Support band:2G:GSM 850/900/1800/1900 Make phone call directly from the smart watch,including answering and dial-up.SIM slot,support make calls by Bluetooth or smart watch Built-in 128MB memory and support external memory card up to 8G Multiple functions for you:Pedometer/Calculator/MMS/SMS/Alarm/Kcal and so on